HashMaps (aka: Dictionaries) in Python
Introduction
Java has a built-in called HashMap. It allows you to store and very quickly retrieve key value pairs.
In Python, this is called a …
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In-depth guides, insights, and best practices for modern software engineering
Find Numbers with Even Number of Digits using Java
The challenge
Given an array nums of integers, return how many of them contain an even number of digits.
Example 1:
Example 2:
Constraints:
1 …
The Relational Database Model
Relational databases first made an appearance in the mid-1970s, between the years 1974 and 1977 with the creation of Ingres and System R which led to …
Read Article →How to use a Java HashSet by example
What is a HashSet
A HashSet is an unordered collection containing unique elements. It has the standard collection operations Add, Remove, Contains, …
Get The Shortest Path in Binary Matrix using Python
The challenge
In an N by N square grid, each cell is either empty (0) or blocked (1).
A clear path from top-left to bottom-right has length k if and …
Palindrome Partitioning in Python
The problem
Given a string s, partition s such that every substring of the partition is a palindrome.
Return all possible palindrome partitioning of s …
Read Article →Faster alternative to MySQL Delete Table Contents / Truncate
From time to time you might have some rather big tables that you want to delete all the data quickly and start afresh.
You have a few options at this …
Read Article →Best Time to Buy and Sell Stock with Python
The problem
Say you have an array prices for which the ith element is the price of a given stock on day i.
Design an algorithm to find the maximum …
Read Article →IPv4 CIDR Chart
CIDR stands for Classless Inter-Domain Routing and is a method for allocating IP addresses as well as for IP routing.
It was introduced in 1993 by the …
Read Article →Recursively Delete Files and Folders and all Contents using PHP
Below is a quick and easy way to recursively delete all files and folders in a given path using PHP.
function destroy_dir($dir) {
if (!is_dir($dir) …Product Update: ADD becomes Serengeti
As a product update; The “Autonomous Distributed Database”, otherwise known as simply ADD has been renamed to Serengeti.
The Serengeti is …
Read Article →SQL to Append all Fields if Shorter than a set Length
This came in very handy for me at one point because I needed to have a certain field in each row 14 characters long, but half of them were only 12 …
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